Double boiler



Sept. 27, 1938. w K L 2,131,287

DOUBLE BOILER Filed Jan. 4, 1938 s x 2? 4 3mm MLIZK Q2167 Patented Se t. 27, 1938 UNITED STATES PATENT OFFICE Application January 4,

1 Claim.

This invention relates to heaters or boilers for heating or processing honey or other liquids, semi-solids or solids, and the general object of the invention is to provide a heater or boiler of this character so constructed that heat is applied only at the bottom of the container or boiler where the coldest part of any liquid or semi-liquid remains during the heating process, so that the warmed up parts of the liquid rise and are not reheated and caused to deteriorate as in other styles of double boilers known to me.

A further object is to provide a device of this character which, as before stated, is particularly adapted for processing honey and which is so constructed that the honey will not be burned or overheated and which shall be particularly simple and cheap to construct.

My invention is illustrated in the accompanying drawing wherein:

Fig. 1 is a top plan View of the structure shown in Fig. 2.

Fig. 2 is a vertical section of the structure shown in Fig. 1.

Referring to the drawing, l designates the body of the boiler, this body constituting a container. The body ID has a lower bottom I l and an upper bottom I2, defining between these double bottoms the space l3. The bottom I2 is preferably slightly conical, that is, it rises up toward the center of the container l0 and at this point is connected to a vent pipe I4 which extends upward from the center of the bottom l2 to the full height of the container l0 and at its upper end is supported by means of a transversely extending brace l5. Extending from one side of the boiler Ill just above the lowest portion of the bottom I2 is a faucet or discharge spout l6 provided with a valve or gate II. For the purpose of filling the water space I3, I provide the inlet hopper [8 which extends upward on the side of the container l0 and has an open top and at its lower end opens into the interior of the space [3. A drainage opening I9 may be provided in the lower end of this inlet hopper or any other point in the bottom H, the purpose being, of course, to drain out the water from the space I3 when desired. The hopper l8 extends up high enough above the upper portion of the space I3 1938, Serial No. 183,387

as to indicate when this space l3 has been filled with water. Thus the member [8 constitutes means whereby the level of water may be observed.

Obviously the container I 0 or boiler proper is to be filled with liquid such as honey, while the space I3 is to be filled with water. The boiler is then placed upon a stove or over any source of heat and the contents of the container heated to any desired degree. The container may be 10 provided with a cover if desired. Steam generated by the heating of the water in the space l3 will pass out through the vent I4. It will be seen that this style of double boiler is very cheaply constructed and while it has a large capacity, takes up relatively small amount of space. I have found the device tobe particularly adapted for liquefying honey, in processing green honey, maple sugar and the like.

While I have illustrated the vent as being disposed at the center of the bottom [2 and extending axially through the container, I do not wish to be limited to this as the vent might be otherwise aranged. This boiler could be heated either by an open flame or by introducing live steam .25

into the chamber l3 or by putting a coil in the chamber and passing steam through the coil. In any case, it is the fluid within the chamber l3 that is heated and it is the heat of this fluid which is communicated to the honey or other material in the boiler.

What is claimed is:-

A boiler of the character described, comprising a container having a bottom and a conical false bottom disposed within the container above the first-named bottom and having a vent opening at its center with a vent pipe extending upward from this opening to the top of the container, means bracing the vent pipe from the side wall of the container, an outlet spout extending from the container just above the lowest portion of the false bottom and having a gate, and a filling hopper opening into the space defined between the first-named bottom and the false bottom, the inlet hopper extending up along the side wall of the container and being open at its upper end.

WALTER T. KELLEY. 

